Promise of Power
Sorcery
Choose one —
• You draw five cards and you lose 5 life.
• Create an X/X black Demon creature token with [[ keyword: "flying" ]], where X is the number of cards in your hand.
Entwine 
Kev Walker
Rulings
The power and toughness of the Demon token are set when Promise of Power resolves. They’re unaffected if the number of cards in your hand changes later.
(wotc • 2004-12-01)
If you pay the entwine cost, you draw five cards, then lose five life, then put the Demon token onto the battlefield. The five cards you draw count toward the Demon’s power and toughness.
(wotc • 2004-12-01)
The power/toughness of the token is set when this spell resolves.
(wotc • 2004-10-04)
Printings
Rulings
The power and toughness of the Demon token are set when Promise of Power resolves. They’re unaffected if the number of cards in your hand changes later.
(wotc • 2004-12-01)
If you pay the entwine cost, you draw five cards, then lose five life, then put the Demon token onto the battlefield. The five cards you draw count toward the Demon’s power and toughness.
(wotc • 2004-12-01)
The power/toughness of the token is set when this spell resolves.
(wotc • 2004-10-04)